Rate coefficients for rotationally inelastic collisions of CO with H2

We have performed quantum-scattering calculations to determine inelastic rate coefficients of the astrophysically important collision system CO-H2. We have used a modified version of the most recent potential-energy surface by Jankowski and Szalewicz (J. Chem. Phys. 108, 3554 (1998)), which has been proven to be superior to a previous potential surface by comparison with experimental pressure broadening data. In contrast to previous studies we find that inelastic rates with D J = 2 for CO are smaller than those with D J = 1.